... | ... | @@ -11,6 +11,10 @@ Gelatin discs can be molded in the same way as [urethane](https://git-xen.lmgc.u |
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After removing the gels from the molds, place them in a 10 weight percent glutaraldehyde solution for about 2 hours. This cross-links the gels, so that they will no longer dissolve in water ([Olde Damink et al](https://link.springer.com/article/10.1007/BF00123371)). Glutaraldehyde is toxic, so make sure to use gloves. Other cross-linkers do exist, but not all of them retain the photoelastic properties of the gelatin. Remove the gels from the glutaraldehyde solution, and wash them repeatedly with water, by leaving the gels in an excess amount of water for at least 12 hours. Repeat the washing procedure a few times to ensure all glutaraldehyde is washed away and diffused out of the gels.
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![SqueezeGelDisk](uploads/9b696b8bdcf3fe7fa0ec8582629f9a53/SqueezeGelDisk.MP4)
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Video of the photoelastic response of a gelatin disk.
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Making cross-linked gelatin spheres
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